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Modification method for improving industrial lignin activity

A technology for industrial lignin and lignin, which is applied in the field of modification treatment of industrial lignin by catalytic transfer hydrogenation, can solve the problems of low activity, waste of resources, unfavorable industrial utilization, etc. Added value and activity improvement effect

Inactive Publication Date: 2015-04-22
NORTHEAST FORESTRY UNIVERSITY
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Problems solved by technology

[0002] The main source of industrial lignin is papermaking waste liquid, most of which are discharged as waste, which is a waste of resources and pollutes the environment. Industrial lignin has few active groups and low activity, which is not conducive to industrial utilization

Method used

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  • Modification method for improving industrial lignin activity
  • Modification method for improving industrial lignin activity
  • Modification method for improving industrial lignin activity

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Embodiment Construction

[0024] The above and other technical features and advantages of the present invention will be described in more detail below in conjunction with the accompanying drawings.

[0025] In the present invention, ammonium formate and palladium carbon catalysts are used to modify industrial lignin by catalytic transfer hydrogenation method. The process parameters are set as temperature: 20-80°C, time: 1.5-2.5h, catalyst dosage: modified industrial 20%-40% of lignin mass, pH: 10-13, ammonium formate addition amount is 200%-400% of modified lignin.

[0026] The specific process of catalytic transfer hydrogenation method of Pd / C catalyst and ammonium formate hydrogen donor system is as follows:

[0027] Step a, weigh a certain amount of ammonium lignosulfonate, put it into the sodium hydroxide solution, stir continuously to dissolve the ammonium lignosulfonate, add a certain amount of absolute ethanol, heat and stir with a magnetic stirrer for a period of time to make the lignin well m...

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Abstract

The invention relates to a modification method for improving industrial lignin activity. According to the invention, ammonium formate and palladium carbon catalysts are utilized; and with a catalytic transfer hydrogenation method, industrial lignin is subjected to a modification treatment. The adopted reagents are environment-friendly and non-toxic. Mainly, the industrial lignin phenolic hydroxyl group content is improved, such that lignin activity is improved, and the lignin added value is increased. With the method, the industrial lignin phenolic hydroxyl group content is improved by approximately 40% when compared with the content before modification.

Description

technical field [0001] The invention relates to the field of industrial lignin modification treatment, in particular to a method for modifying industrial lignin by catalytic transfer hydrogenation. Background technique [0002] The main source of industrial lignin is papermaking waste liquid, most of which are discharged as waste, which is a waste of resources and pollutes the environment. Industrial lignin has few active groups and low activity, which is not conducive to industrial utilization. Through modification, the phenolic hydroxyl content of industrial lignin is increased, and the activity is improved. It can replace part of phenol and the like for the preparation of phenolic resin glue, relieve the pressure on petroleum resources, and reduce the toxicity of fiberboard preparation. [0003] In view of the above-mentioned defects, the author of the present invention has finally obtained this creation through research and practice. Contents of the invention [0004]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08H7/00
Inventor 张帆郭明辉黄平平
Owner NORTHEAST FORESTRY UNIVERSITY
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